Subject: Re: [Healeys] Speedo Drive Thread Size?

From: John Vrugtman <[email-masked]>
Date: Sun, 8 Aug 2021 12:38:10 -0400

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https://britishfasteners.com/threads-bsc 
<https://britishfasteners.com/threads-bsc>

On 8/8/2021 12:26 PM, Harold Manifold via Healeys wrote:
>
> Just when I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, 
> etc. along comes BSC (British Standard Cycle). The threads on the 
> transmission speedo drive and the angle drive are not the best and 
> could use a refreshed. The pitch is 26 TPI and the diameter is ¾” as 
> best I can measure. After searching Google the closest match I could 
> find is 3/4" X 26 TPI BSC.
>
> I have never heard of British Standard Cycle before. Can anyone 
> confirm if this is the tread size?
>
> Harold
>
>
>

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    <a moz-do-not-send="true"
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    <br>
    <div class="moz-cite-prefix">On 8/8/2021 12:26 PM, Harold Manifold
      via Healeys wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:[email-masked]">
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      <div class="WordSection1">
        <p class="MsoNormal">Just when I thought I had a handle
          Whitworth, BSPP, BSPT, SAE, UNF, etc. along comes BSC (British
          Standard Cycle). The threads on the transmission speedo drive
          and the angle drive are not the best and could use a
          refreshed. The pitch is 26 TPI and the diameter is ¾” as best
          I can measure. After searching Google the closest match I
          could find is 3/4" X 26 TPI BSC.</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">I have never heard of British Standard
          Cycle before. Can anyone confirm if this is the tread size?</p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal">Harold<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
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From: Michael Salter via Healeys <[email-masked]>
Date: Sun, 8 Aug 2021 13:39:15 -0400

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Not to mention MODELLER'S THREAD ... cor blimey!!

On Sun., Aug. 8, 2021, 12:26 p.m. Harold Manifold via Healeys, <
[email-masked]> wrote:

> Just when I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, etc.
> along comes BSC (British Standard Cycle). The threads on the transmission
> speedo drive and the angle drive are not the best and could use a
> refreshed. The pitch is 26 TPI and the diameter is =C2=BE=E2=80=9D as bes=
t I can
> measure. After searching Google the closest match I could find is 3/4" X =
26
> TPI BSC.
>
>
>
> I have never heard of British Standard Cycle before. Can anyone confirm i=
f
> this is the tread size?
> Support Team.Net http://www.team.net/donate.html
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<div dir=3D"auto">Not to mention MODELLER&#39;S THREAD ... cor blimey!!</di=
v><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On S=
un., Aug. 8, 2021, 12:26 p.m. Harold Manifold via Healeys, &lt;<a href=3D"m=
ailto:[email-masked]">[email-masked]</a>&gt; wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:=
1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" style=3D"word-wrap:bre=
ak-word"><div class=3D"m_3894693911524187653WordSection1"><p class=3D"MsoNo=
rmal">Just when I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, e=
tc. along comes BSC (British Standard Cycle). The threads on the transmissi=
on speedo drive and the angle drive are not the best and could use a refres=
hed. The pitch is 26 TPI and the diameter is =C2=BE=E2=80=9D as best I can =
measure. After searching Google the closest match I could find is 3/4&quot;=
 X 26 TPI BSC.</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=
=3D"MsoNormal">I have never heard of British Standard Cycle before. Can any=
one confirm if this is the tread size?</p><p class=3D"MsoNormal"><u></u>=C2=
=A0<u></u></p><p class=3D"MsoNormal">Harold<u></u><u></u></p><p class=3D"Ms=
oNormal"><u></u>=C2=A0<u></u></p></div></div>
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[email-masked]

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From: Curtis Arndt via Healeys <[email-masked]>
Date: Mon, 9 Aug 2021 09:35:51 -0700

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Listers,

The most common BSC tread used on AHs was the steering wheel shaft thread
and nut.

Also BSC is the early version of, and was superseded by CEI - Cycle
Engineers Institute.

Both BSC and CEI are NOT Whitworth thread forms since they have a 60 degree
thread pitch versus the 55 degree pitch of a Whitworth thread form. The
confusion arises in that fact that the hex heads on either BSC or CEI ( I
can't recall off the top of my head) can be BS/W requiring the appropriate
spanner.

See the attached pdf draft of my article on the subject. Any suggestions
for this article would be greatly appreciated.

Cheers,

Curt Arndt

t I can
26
f
> Harold

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<div dir=3D"ltr"><div dir=3D"ltr">Listers,</div><div dir=3D"ltr"><br></div>=
<div dir=3D"ltr">The most common BSC tread used on AHs was the steering whe=
el shaft thread and nut.=C2=A0<div><br></div><div>Also BSC is the early=C2=
=A0version of, and was superseded by CEI - Cycle Engineers Institute.=C2=A0=
</div><div><br></div><div>Both BSC and CEI are NOT Whitworth thread forms s=
ince they have a 60 degree thread pitch versus the 55 degree pitch of a Whi=
tworth thread form. The confusion arises in that fact that the hex heads on=
 either BSC or CEI ( I can&#39;t recall off the top of my head) can be BS/W=
 requiring the appropriate spanner.</div><div><br></div><div>See the attach=
ed pdf draft of my article on the subject. Any suggestions for this article=
 would be greatly appreciated.</div><div><br></div><div>Cheers,</div><div><=
br></div><div>Curt Arndt</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sun, Aug 8, 2021 at 9:27 AM Harold Manifol=
d via Healeys &lt;<a href=3D"mailto:[email-masked]">[email-masked]=
eam.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"><div lang=3D"EN-US" style=3D"overflow-wrap: break-word;"><div class=
=3D"gmail-m_-6198889839936711389WordSection1"><p class=3D"MsoNormal">Just w=
hen I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, etc. along co=
mes BSC (British Standard Cycle). The threads on the transmission speedo dr=
ive and the angle drive are not the best and could use a refreshed. The pit=
ch is 26 TPI and the diameter is =C2=BE=E2=80=9D as best I can measure. Aft=
er searching Google the closest match I could find is 3/4&quot; X 26 TPI BS=
C.</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal"=
>I have never heard of British Standard Cycle before. Can anyone confirm if=
 this is the tread size?</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>=
<p class=3D"MsoNormal">Harold</p></div></div>
</blockquote></div></div>

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[email-masked]

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From: Curtis Arndt <[email-masked]>
Date: Mon, 9 Aug 2021 09:43:16 -0700

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Correction...

*Cycle engineers Institute (CEI)* - Older cycle thread superseded by BSC.
The angle of the threads is 60=C2=B0. Not used on Austin Healeys.

On Mon, Aug 9, 2021 at 9:35 AM Curtis Arndt <[email-masked]> wrote:

> Both BSC and CEI are NOT Whitworth thread forms since they have a 60
> degree thread pitch versus the 55 degree pitch of a Whitworth thread form=
.
> The confusion arises in that fact that the hex heads on either BSC or CEI=
 (
> I can't recall off the top of my head) can be BS/W requiring the
> appropriate spanner.
>
>> along comes BSC (British Standard Cycle). The threads on the transmissio=
n
>> refreshed. The pitch is 26 TPI and the diameter is =C2=BE=E2=80=9D as be=
st I can
>> measure. After searching Google the closest match I could find is 3/4" X=
 26
>> TPI BSC.
>>
>>
>>
>> I have never heard of British Standard Cycle before. Can anyone confirm
>> if this is the tread size?
>>
>>
>>
>> Harold
>>
>

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<div dir=3D"ltr">Correction...<div><br></div><div><b><span style=3D"font-si=
ze:11pt;font-family:&quot;Liberation Serif&quot;,serif">Cycle engineers
Institute (CEI)</span></b><span style=3D"font-size:11pt;font-family:&quot;L=
iberation Serif&quot;,serif"> - Older cycle thread
superseded by BSC.=C2=A0 The angle of the threads is 60=C2=B0</span><span s=
tyle=3D"font-size:11pt;font-family:Verdana,sans-serif">.=C2=A0</span><span =
style=3D"font-size:11pt;font-family:&quot;Liberation Serif&quot;,serif">Not=
 used on Austin Healeys.</span><br></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 9, 2021 at 9:35 AM Cur=
tis Arndt &lt;<a href=3D"mailto:[email-masked]">[email-masked]</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div =
dir=3D"ltr"><div dir=3D"ltr">Listers,</div><div dir=3D"ltr"><br></div><div =
dir=3D"ltr">The most common BSC tread used on AHs was the steering wheel sh=
aft thread and nut.=C2=A0<div><br></div><div>Also BSC is the early=C2=A0ver=
sion of, and was superseded by CEI - Cycle Engineers Institute.=C2=A0</div>=
<div><br></div><div>Both BSC and CEI are NOT Whitworth thread forms since t=
hey have a 60 degree thread pitch versus the 55 degree pitch of a Whitworth=
 thread form. The confusion arises in that fact that the hex heads on eithe=
r BSC or CEI ( I can&#39;t recall off the top of my head) can be BS/W requi=
ring the appropriate spanner.</div><div><br></div><div>See the attached pdf=
 draft of my article on the subject. Any suggestions for this article would=
 be greatly appreciated.</div><div><br></div><div>Cheers,</div><div><br></d=
iv><div>Curt Arndt</div></div><br><div class=3D"gmail_quote"><div dir=3D"lt=
r" class=3D"gmail_attr">On Sun, Aug 8, 2021 at 9:27 AM Harold Manifold via =
Healeys &lt;<a href=3D"mailto:[email-masked]" target=3D"_blank">hea=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><div lang=3D"EN-US"><div><p class=3D"MsoNormal">Just whe=
n I thought I had a handle Whitworth, BSPP, BSPT, SAE, UNF, etc. along come=
s BSC (British Standard Cycle). The threads on the transmission speedo driv=
e and the angle drive are not the best and could use a refreshed. The pitch=
 is 26 TPI and the diameter is =C2=BE=E2=80=9D as best I can measure. After=
 searching Google the closest match I could find is 3/4&quot; X 26 TPI BSC.=
</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p class=3D"MsoNormal">I=
 have never heard of British Standard Cycle before. Can anyone confirm if t=
his is the tread size?</p><p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p><p=
 class=3D"MsoNormal">Harold</p></div></div>
</blockquote></div></div>
</blockquote></div>

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[email-masked]

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